Toothbrush head with stepped bristle array



FIG. 1 is a perspective view of my ornamental design for a toothbrush head with stepped bristle array;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a side view thereof, the opposite side being a mirror image of that shown. 

The ornamental design for a toothbrush head with stepped bristle array, as shown and described. 